Now, from a German position: There was a vast (defeatist one could say, from the Catholic PoV) belief in Germany that the reformation would take over anyways. It was the Counterreformation that really breathed in life into the Old Church again. Of course, the Jesuits are only part of it, the Council of Trient was arguably more important, even though the Jesuits did carry its word to all countries.
Still, without the Jesuits, many of the territories that were in the process of the Reformation and then reclaiemd by thee Counterreformation will become protestant - mainly, ironically, the ecclestial lands. I dont think the Reformation would sweep Germany, Catholicism would remain strongolds: The religious status of the Habsburg lands or Bavaria for example would entirely depend on the rulers disposition, and not on Jesuits or not. And of course, the Counterreformation (whose main achievment was to create a catholic identity seperate from the Protestant one, thus ending the Reformation as a reformation) still happens, it just loses its most important agents.